Implement ??= operator

RFC: https://wiki.php.net/rfc/null_coalesce_equal_operator

$a ??= $b is $a ?? ($a = $b), with the difference that $a is only
evaluated once, to the degree

Implement ??= operator

RFC: https://wiki.php.net/rfc/null_coalesce_equal_operator

$a ??= $b is $a ?? ($a = $b), with the difference that $a is only
evaluated once, to the degree that this is possible. In particular
in $a[foo()] ?? $b function foo() is only ever called once.
However, the variable access themselves will be reevaluated.

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Implement typed properties

RFC: https://wiki.php.net/rfc/typed_properties_v2

This is a squash of PR #3734, which is a squash of PR #3313.

Co-authored-by: Bob Weinand <bobwe

Implement typed properties

RFC: https://wiki.php.net/rfc/typed_properties_v2

This is a squash of PR #3734, which is a squash of PR #3313.

Co-authored-by: Bob Weinand <bobwei9@hotmail.com>
Co-authored-by: Joe Watkins <krakjoe@php.net>
Co-authored-by: Dmitry Stogov <dmitry@zend.com>

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Introduce separate ZEND_AST_CLASS_NAME AST node

Instead of representing this as a ZEND_AST_CLASS_CONST with a
"class" constant name.

Class constants and ::class are unrelated fe

Introduce separate ZEND_AST_CLASS_NAME AST node

Instead of representing this as a ZEND_AST_CLASS_CONST with a
"class" constant name.

Class constants and ::class are unrelated features that happen to
share syntax, so represent and handle them separately.

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Future-proof email addresses

Update email addresses. We're still @Zend, but future proofing it...

Avoid hash lookups in BIND_STATIC and BIND_LEXICAL opcode handlers.
Encode static variable offset into opline->extended_value.

Remove unused Git attributes ident

The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
use

Remove unused Git attributes ident

The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
user who changed it.

In Git this functionality is different and can be done with Git attribute
ident. These need to be defined manually for each file in the
.gitattributes file and are afterwards replaced with 40-character
hexadecimal blob object name which is based only on the particular file
contents.

This patch simplifies handling of $Id$ keywords by removing them since
they are not used anymore.

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Remove expr_without_variable

We no longer need this distinction.

Fixed bug #75218

I've introduced a new CompileError type, from which ParseError
inherits. These errors are not parse errors in the narrow sense
of the term, even though they happen t

Fixed bug #75218

I've introduced a new CompileError type, from which ParseError
inherits. These errors are not parse errors in the narrow sense
of the term, even though they happen to be generated during
parsing in our implementation. Additionally reusing the ParseError
class for this purpose would change existing error messages (if
the exception is not caught) from a "Fatal error:" to a "Parse
error:" prefix, and also the error kind from E_COMPILE_ERROR to
E_PARSE.

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Use zend_string_release_ex() instread of zend_string_release() in places, where we sure about string persistence.

Use cheaper functions

Revert "Handle scanner error in first place (don't hide them from ext/tokenizer) and cheaper whitespace handlig."

This reverts commit 0d6da03f5c3e49b92cf6817ba8a7f8d6f60ee1aa.

Handle scanner error in first place (don't hide them from ext/tokenizer) and cheaper whitespace handlig.

year++

year++

year++

Allow trailing commas in function and method calls

further sync for vim mode lines

Add trailing comma syntax support for mixed and unmixed group use lists

RFC: https://wiki.php.net/rfc/list-syntax-trailing-commas

Interned strings unification for TS/NTS

Hereby, interned strings are supported in thread safe PHP. The patch
implements two types of interned strings

- interning per process, st

Interned strings unification for TS/NTS

Hereby, interned strings are supported in thread safe PHP. The patch
implements two types of interned strings

- interning per process, strings are not freed till process end
- interning per request, strings are freed at request end

There is no runtime interning.

With Opcache, all the permanent iterned strings are copied into SHM on
startup, additional copying into SHM might happen on demand.

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Update copyright headers to 2017

Update copyright headers to 2017

Update copyright headers to 2017

Fix T_NUM_STRING negation

T_NUM_STRING follows the rules of symtable numeric string
conversion. If the offset isn't an integer under those rules, it
is treated as a string. This shou

Fix T_NUM_STRING negation

T_NUM_STRING follows the rules of symtable numeric string
conversion. If the offset isn't an integer under those rules, it
is treated as a string. This should apply to negated T_NUM_STRINGs
as well.

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Implement #72918: negative offset inside a quoted string leads to parse error

We allow negative numeric offsets for the simple syntax inside
double-quoted and heredoc strings.